Human Fertilization Animation Video

Description

Sperm Contribution
Sperm contributes nucleus, centriole, mitochondria, cytoplasm (minor);
Several sperm proteins and mRNAs for transcription and
paracrine factors are brought into the egg
Also, microRNAs imported; may downregulate
receptors
involved in early cell division
however,
mitochondria and mitochondrial DNA are degraded
therefore,
all embryonic mitochondria are derived from the mother
(basis for mtDNA tracing of geneology/phylogenetics)